Gaston Froissard, a young Parisian priest, has decided to trade his Roman collar for the life of a monk in the Chartreuse. He was mysteriously called back by the diocese, which required him to immediately resume his priestly duties in a large Parisian parish. These few years of monastic life have profoundly changed the man he was, the effervescence of the city, the preoccupations of his entourage, everything seems out of sync with what animates the soul of this man of sharp principles. The world around him seems to vacillate between reality and mystical visions, pushing his faith to its furthest limits. Father Froissard will eventually learn the real reason for his transfer to Paris, stunned by his fate, these trials will allow him to undertake the only true quest that the man expected of his life: That of reconnecting to the essential.